[https://www.ubuntu.com/community/canonical Canonical is the company that produces Ubuntu] as you are using a third-party build of Firefox from Ubuntu based on useragent in your More System Details and not Firefox from www.mozilla.org/firefox/all/
Perhaps the Search page or search engine you are using is a modified one.
You can change your search engines as there are some at https://addons.mozilla.org/firefox/extensions/search-tools/ and much more at https://mycroftproject.com/
https://support.mozilla.org/en-US/kb/add-or-remove-search-engine-firefox
https://support.mozilla.org/en-US/kb/change-your-default-search-settings-firefox